[all variants] Running Ubuntu on a G4 iMac 800Mhz "Lampstand"

Hi

I am trying to install a recent PPC Ubuntu distribution on a 15" G4 iMac 800Mhz "lampstand" model (lubuntu 14.10, but this applies to other 14.x *ubuntus) and I have done a bit of searching about.


I was successful in installing using the "alternative installation disk" but I have to jump through several hoops to get to the desktop. The following seems to work on my machine (which has NVIDIA N11 GEForce2 MX/MX 400 card):

At yaboot prompt, type
Wait for disk activity to cease (screen shows no activity) / boot to complete, then enter blind:
On hitting return I see the command prompt. I then start the display manager:
..and I get a greeting / login window. Thereafter the desktop works properly.

My question is, how can I configure the yaboot and modprobe steps to happen automatically every bootup (and removing the single user mode boot parameter so that the machine boots straight to the lightdm greeter / login screen)?

Thanks
JonB